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Test Code LAB140 Urea Nitrogen (BUN), Plasma or Serum

Reporting Title

BUN

Methodology

Roche Diagnostics: RMH, BH, DH, DMH, GCMH, GMC, GMH, MGH, MH, OBH, PMH, WECC, HMH, SH

Useful for evaluation of kidney function.

Performing Laboratory

OhioHealth Laboratory Services - RMH, BH, DH, DMH, GCMH, GMC, GMH, HMH, MGH, MH, OBH, PMH, SH, WECC Core Laboratories

Specimen Requirements

Collection Instructions:

1. Serum and Plasma gel tubes should be centrifuged within 2 hours of collection.

2. Red-top tubes should be centrifuged and aliquoted within 2 hours of collection.

 

Submit only 1 of the following specimens:

 

Preferred:

Serum

Draw blood in a gold-top serum gel tube(s). Spin down and send 1 mL of serum refrigerated.
Note:

1. A speckled-top serum gel tube (s) or a plain, red-top tube(s) is also acceptable.

2. Indicate serum on request form.

3. Label specimen appropriately (serum).

 

Alternate:

Plasma

Draw blood in a mint green-top (heparin) gel tube(s). Spin down and send 1 mL of heparinized plasma refrigerated.

Note:  1. Indicate plasma on request form.

2. Label specimen appropriately (plasma).

 

Specimen Stability Information

Specimen Type Temperature Time
Serum or plasma Refrigerated 7 days
  Ambient  7 days
  Frozen  12 months

 

Specimen Transport Temperature

Refrigerate/Ambient OK/Frozen OK

Reference Values

8-25 mg/dL

Critical value >100 mg/dL (non-dialysis patient)

Alerting category:  First instance within 1 hour (initial result only, routine on results thereafter)

 

Day(s) Test Set Up

Monday through Sunday; Continuously

Test Classification and CPT Coding

84520